S1G General Purpose Rectifier Diode 400V 1A DO-214AC Equivalent & Substitute Parts

Part Overview

The S1G is a general purpose rectifier diode rated for 400V DC reverse voltage and 1A average rectified current in a surface mount DO-214AC (SMA) package. The original Vishay General Semiconductor S1G component is classified as obsolete, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating modern RoHS compliance requirements and active product availability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	1.1	V @ 1 A
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 150	°C
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S1G rectifier diode is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) rating of 400V minimum
Current - Average Rectified (Io) rating of 1A minimum
Surface mount package compatibility (DO-214AC/SMA or equivalent form factor)
Operating temperature range encompassing -55°C to 150°C minimum

Secondary Compatibility Factors:

Forward voltage (Vf) at rated current within acceptable circuit design margins
Recovery speed classification (Standard or Fast recovery acceptable)
RoHS compliance status for modern manufacturing environments
Moisture sensitivity level MSL 1 (unlimited shelf life)

Parts are grouped into two categories: Direct Electrical Equivalents (matching all primary criteria with active product status) and Functional Alternatives (meeting electrical requirements with different recovery characteristics or package variants). Parts with automotive qualification (AEC-Q100/Q101) are suitable for general purpose applications but not required for standard industrial use.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (V)	Recovery Speed	trr (µs/ns)	Package	Temp Range (°C)	Product Status	RoHS
S1G	Vishay General Semiconductor	400	1	1.1 @ 1A	Standard >500ns	1.8 µs	DO-214AC	-55 to 150	Obsolete	Non-compliant
S1G	Diotec Semiconductor	400	1	1.1 @ 1A	Standard >500ns	1.5 µs	DO-214AC	-50 to 150	Active	ROHS3 Compliant
CGRA4004-G	Comchip Technology	400	1	1.1 @ 1A	Standard >500ns	—	DO-214AC	-55 to 150	Active	ROHS3 Compliant
ES1G	Good-Ark Semiconductor	400	1	1.3 @ 1A	Fast ≤500ns	35 ns	DO-214AC	-55 to 125	Active	ROHS3 Compliant
ES1G-13-F	Diodes Incorporated	400	1	1.25 @ 1A	Fast ≤500ns	25 ns	DO-214AC	-55 to 150	Active	ROHS3 Compliant
GF1G	onsemi	400	1	1.0 @ 1A	Standard >500ns	2 µs	DO-214AC	-65 to 175	Not For New Designs	ROHS3 Compliant
GS1G-LTP	Micro Commercial Co	400	1	1.0 @ 1A	Standard >500ns	—	DO-214AC	-55 to 150	Not For New Designs	ROHS3 Compliant
MRA4004T3G	onsemi	400	1	1.1 @ 1A	Standard >500ns	—	DO-214AC	-55 to 175	Not For New Designs	ROHS3 Compliant
NRVA4004T3G	onsemi	400	1	1.1 @ 1A	Standard >500ns	—	DO-214AC	-55 to 175	Not For New Designs	ROHS3 Compliant
PNS40010ER,115	Nexperia USA Inc.	400	1	1.1 @ 1A	Standard >500ns	1.8 µs	SOD-123W	—	Active	ROHS3 Compliant
RR2L4SDDTE25	Rohm Semiconductor	400	2	1.1 @ 2A	Standard >500ns	—	DO-214AC	—	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Product Status):

S1G (Diotec Semiconductor) — Direct part number match with active manufacturing status. Electrical specifications identical to original Vishay component. ROHS3 compliant. Reverse recovery time improved to 1.5 µs. Operating temperature range -50°C to 150°C meets standard industrial requirements. Preferred for direct replacement in new designs.
CGRA4004-G (Comchip Technology) — Meets all electrical parameters with identical forward voltage and recovery speed classification. Operating temperature range -55°C to 150°C matches original specification. ROHS3 compliant. Active product status with established supply chain.
ES1G-13-F (Diodes Incorporated) — Fast recovery variant (25 ns trr) suitable for applications requiring reduced switching losses. Forward voltage 1.25V at 1A acceptable for most circuit topologies. Operating temperature -55°C to 150°C. ROHS3 compliant with high inventory availability.

Alternative Substitutes (Not For New Designs Status):

Parts classified as "Not For New Designs" (GF1G, GS1G-LTP, MRA4004T3G, NRVA4004T3G) meet electrical equivalence requirements and remain suitable for legacy system maintenance and repair applications. NRVA4004T3G includes automotive qualification (AEC-Q101) for applications requiring automotive-grade components.

Package Variant:

PNS40010ER,115 (Nexperia) provides SOD-123W package alternative to DO-214AC. Electrical specifications match original S1G. Automotive qualification (AEC-Q100) available. Package change requires PCB layout modification.

Current Rating Consideration:

RR2L4SDDTE25 (Rohm) rated for 2A average rectified current. Exceeds 1A requirement and suitable for applications requiring higher current capacity within 400V rating. PMDS package differs from standard DO-214AC.

Frequently Asked Questions (FAQ)

Q: Can I substitute the obsolete Vishay S1G with any of the listed alternatives?

A: Yes. All listed parts meet the primary electrical requirements: 400V reverse voltage rating, 1A average rectified current, and surface mount package compatibility. The Diotec S1G, Comchip CGRA4004-G, and Diodes ES1G-13-F are recommended for new designs due to active product status. Parts marked "Not For New Designs" remain functionally equivalent for replacement applications.

Q: What is the difference between Standard and Fast recovery diodes in this list?

A: Recovery speed refers to reverse recovery time (trr). Standard recovery diodes (>500ns) are suitable for general purpose rectification and power supply applications. Fast recovery diodes (≤500ns) reduce switching losses and are preferred in high-frequency switching circuits. Both types are electrically compatible at 400V/1A ratings; selection depends on circuit operating frequency.

Q: Does the forward voltage difference between parts affect circuit operation?

A: Forward voltage variations (1.0V to 1.3V at 1A) are within acceptable design margins for most rectifier applications. Voltage drop across the diode contributes to power dissipation and heat generation. Applications with tight thermal budgets or high-frequency operation should verify forward voltage specifications against circuit requirements. The original S1G specification of 1.1V is matched by Diotec S1G, CGRA4004-G, MRA4004T3G, NRVA4004T3G, and PNS40010ER,115.

Q: Can I use the PNS40010ER,115 (SOD-123W package) as a direct replacement?

A: Electrical specifications are equivalent; however, SOD-123W package dimensions differ from DO-214AC (SMA). PCB footprint and land pattern modifications are required. PNS40010ER,115 is suitable only if PCB layout can accommodate the alternative package geometry.

Q: Is RoHS compliance mandatory for my application?

A: The original Vishay S1G is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, meeting current environmental regulations for manufacturing and distribution in regulated markets. RoHS compliance is standard for active production parts and recommended for all new designs.

Q: What is the significance of the operating temperature range difference?

A: The original S1G operates -55°C to 150°C. Diotec S1G operates -50°C to -150°C (5°C reduction at lower limit). GF1G and onsemi variants extend to -65°C or 175°C maximum. Temperature range selection depends on application environment. Standard industrial applications typically operate within -40°C to 85°C, making all listed substitutes suitable.

Q: Are automotive-qualified parts (NRVA4004T3G, PNS40010ER,115) required for general purpose applications?

A: Automotive qualification (AEC-Q100/Q101) is not required for standard industrial rectifier applications. These certifications indicate enhanced reliability testing and traceability suitable for automotive and safety-critical systems. General purpose applications can use non-automotive qualified equivalents.

Q: What inventory considerations should I evaluate?

A: Diotec S1G (29,439 pcs), Good-Ark ES1G (415,300 pcs), and Diodes ES1G-13-F (420,300 pcs) demonstrate high inventory availability. Comchip CGRA4004-G (20,100 pcs) and onsemi MRA4004T3G (155,400 pcs) provide adequate supply. Nexperia PNS40010ER,115 (5,813 pcs) and Rohm RR2L4SDDTE25 (2,900 pcs) show lower availability. Inventory levels influence lead time and cost considerations for procurement planning.

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